Thanks Jeff and all

Last flight (after playing around with Mode #1 tuning on the ground) the Primaries (4 port Red) were saturating at various times, indicated as Steve Boese reminded me, by the loss of RPM readouts (EM3 & Dynon Skyview) sensed from the Primary Injector line.
Do others with small Primaries have this issue or is it a Tuning issue?
ie. Getting modes # 3,6,2 right will spread the load between the Pri and Secondaries so the primaries don’t saturate?
I do have another set of the larger (Blue) secondary injectors that could replace the small red Primaries giving us 4 equal injectors, if this was helpful.
Do injectors have a sweet spot or better spray pattern at a particular band of duty cycle?

We have an electric inflight adjustable prop which may make a difference from those with experience with FP props.

On another note, I rechecked max fuel flow at static ~6800 rpm and 0.92 Lambda which I think is best power. Fuel Flow peeks at 16.4 Gal/hr.
It's a Renesis 4 Port with the stock exhaust header and resonator and a modified stock intake manifold which is basically shortened from 23.6” to 18.1”.
I had noted down that Tracy recommended 16” and Paul L 20”  for the intake length.
What kind of hp do you think this might be producing and what are others seeing?

How could we determine peak power/rpm? Could we use the airframe as a dyno in some way?
What about at WOT clean air and level, and adjust prop pitch/rpm for maximum airspeed.
I suppose is we kept the mixture constant we could look for highest fuel flow.
I’m trying ti ascertain the best rpm for takeoff.
At the moment I’m leaving the prop set fine and rpm is peaking at ~7500 on climb out.

Your expertise and insights would be greatly appreciated.

Steve Izett

On 19 Jun 2020, at 9:37 pm, Jeff Whaley jwhaley@datacast.com <flyrotary@lancaironline.net> wrote:

I don't think you're missing anything Steve - my EC2 is the same : fixed at 20" ...

It was originally 15.5" and could be set anywhere ... but after sent back to Tracy it is now 20" and cannot be changed.

Jeff

Hi people.

I did some tuning this morning.

But I couldn't get the staging point to change.

I reset all modes to default.

The built in default Stage Point on my EC2 seems to be ~20"

Ran engine at the desired MAP, selected Mode #7  (I was aiming at 15.5") and pressed the Store Button.

I also tried holding it for a few seconds.

Staging Point stayed at ~20".

What am I missing here?

Steve Izett

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